Rockies designated LHP Sean Thompson for assignment.
The Rockies would prefer to keep him after claiming him from the Royals last month, but they judged him their most expendable player.
Rockies placed infielder-outfielder Jeff Baker on the 15-day disabled list with a mild concussion.
Baker goes on the DL even though all the tests on him after he was hit in the face by a pitch last night came back negative.
The Rockies are likely happy that they'll be able to get him at-bats in Triple-A for a week or two.
Rockies purchased the contract of third baseman Ian Stewart from Triple-A Colorado Springs.
Stewart is going to start at third base tonight, with Garrett Atkins moving over to first base in place of Todd Helton.
The top prospect might be sent back down once Helton is fully recovered from back spasms, but even if that happens, he'd get another chance in September.
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